Optical fiber communication cl9 te z/ arccos ne 73 O L(aB)=-101g 2Nt 2NtV(2Nt 一般 6<<①<<MA/ max L(dB)≈-10lg(1 D、参数 mismatching C=aN4≠N L(dBr101g/NA) NA>NA NA=Sin NA 0 NA< NA G2-n2)2=n1(2A1 -19 Copyright Wang Yan 2021/2/19 Optical fiber communications C、Tile 一般     = − − − 2 3 3 3 2 1 2 2 arccos 2 ( ) 10lg Nt n Nt n Nt n L dB     max 3     NA / n ( ) 10lg( 1 ) 3 NA n L dB    − − D、参数mismatching 1、 a = a NA  NA     0 10lg ( ) 2 NA NA L dB NA NA NA NA     ( ) 1/ 2 1 1/ 2 22 2 max(2 ) sin  1 − =  = n n n NA 